Make hellowindow multi display capable on embedded

Platforms like eglfs allow a single window per screen. Thus the behavior of
--multiple is not suitable since it tries to open multiple windows on the
primary screen. Instead, introduce --multiscreen.

Add also --timeout to quit the app after 10 seconds. This is essential on
platforms that do not have windows with decorations that can be used to
close windows.

With eglfs' kms/drm hooks, starting with --multiscreen will now show a
rotating logo on all connected displays, with some random background color.

Change-Id: I53f2651f05620e752c289038a9b3ff4508273173
Reviewed-by: Louai Al-Khanji <louai.al-khanji@digia.com>
Reviewed-by: Andy Nichols <andy.nichols@digia.com>

1 files changed, 13 insertions, 5 deletions

diff --git a/examples/opengl/hellowindow/main.cpp b/examples/opengl/hellowindow/main.cpp
index 62b6bfca3f..e7ad9722c2 100644
--- a/examples/opengl/hellowindow/main.cpp
+++ b/examples/opengl/hellowindow/main.cpp
@@ -50,7 +50,9 @@ int main(int argc, char *argv[])
 {
     QGuiApplication app(argc, argv);
 
+    // Some platforms can only have one window per screen. Therefore we need to differentiate.
     const bool multipleWindows = QGuiApplication::arguments().contains(QStringLiteral("--multiple"));
+    const bool multipleScreens = QGuiApplication::arguments().contains(QStringLiteral("--multiscreen"));
 
     QScreen *screen = QGuiApplication::primaryScreen();
 
@@ -93,12 +95,13 @@ int main(int argc, char *argv[])
         windowC->setTitle(QStringLiteral("Thread B - Context B"));
         windowC->setVisible(true);
         windows.prepend(windowC);
-
+    }
+    if (multipleScreens) {
         for (int i = 1; i < QGuiApplication::screens().size(); ++i) {
             QScreen *screen = QGuiApplication::screens().at(i);
             QSharedPointer<Renderer> renderer(new Renderer(format, rendererA.data(), screen));
 
-            renderThread = new QThread;
+            QThread *renderThread = new QThread;
             renderer->moveToThread(renderThread);
             renderThreads.prepend(renderThread);
 
@@ -107,8 +110,7 @@ int main(int argc, char *argv[])
 
             QSize windowSize = screenGeometry.size() * 0.8;
 
-            HelloWindow *window = new HelloWindow(renderer);
-            window->setScreen(screen);
+            HelloWindow *window = new HelloWindow(renderer, screen);
             window->setGeometry(QRect(center, windowSize).translated(-windowSize.width() / 2, -windowSize.height() / 2));
 
             QChar id = QChar('B' + i);
@@ -123,10 +125,16 @@ int main(int argc, char *argv[])
         renderThreads.at(i)->start();
     }
 
+    // Quit after 10 seconds. For platforms that do not have windows that are closeable.
+    if (QCoreApplication::arguments().contains(QStringLiteral("--timeout")))
+        QTimer::singleShot(10000, qGuiApp, SLOT(quit()));
+
     const int exitValue = app.exec();
 
-    for (int i = 0; i < renderThreads.size(); ++i)
+    for (int i = 0; i < renderThreads.size(); ++i) {
+        renderThreads.at(i)->quit(); // some platforms may not have windows to close so ensure quit()
         renderThreads.at(i)->wait();
+    }
 
     qDeleteAll(windows);
     qDeleteAll(renderThreads);